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+/* Copyright (C) 2018 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+/*!
+ * \file
+ *
+ * \brief TSIG operations
+ *
+ * \addtogroup knot-tsig
+ * @{
+ */
+
+#pragma once
+
+#include "libknot/dname.h"
+#include "libdnssec/tsig.h"
+
+/*!
+ * \brief TSIG key.
+ */
+typedef struct {
+ dnssec_tsig_algorithm_t algorithm;
+ knot_dname_t *name;
+ dnssec_binary_t secret;
+} knot_tsig_key_t;
+
+/*!
+ * \brief Packet signing context.
+ */
+typedef struct {
+ knot_tsig_key_t tsig_key;
+ uint8_t *tsig_digest;
+ size_t tsig_digestlen;
+ uint64_t tsig_time_signed;
+ size_t pkt_count;
+} knot_sign_context_t;
+
+/*!
+ * \brief Initialize a new TSIG key from individual key parameters.
+ *
+ * \param[out] key Key to be initialized.
+ * \param[in] algorithm Algorithm name. NULL for default (hmac-md5).
+ * \param[in] name Key name (domain name in presentation format).
+ * \param[in] secret_b64 Secret encoded using Base 64.
+ *
+ * \return Error code, KNOT_EOK if successful.
+ */
+int knot_tsig_key_init(knot_tsig_key_t *key, const char *algorithm,
+ const char *name, const char *secret_b64);
+
+/*!
+ * \brief Create a new TSIG key from a string encoding all parameters.
+ *
+ * \param[out] key Key to be initialized.
+ * \param[in] params Parameters in a form \a [algorithm:]name:base64_secret
+ */
+int knot_tsig_key_init_str(knot_tsig_key_t *key, const char *params);
+
+/*!
+ * \brief Create a new TSIG key by reading the parameters from a file.
+ *
+ * The file content is parsed by \a tsig_key_create_str.
+ */
+int knot_tsig_key_init_file(knot_tsig_key_t *key, const char *filename);
+
+/*!
+ * \brief Deinitialize TSIG key.
+ */
+void knot_tsig_key_deinit(knot_tsig_key_t *key);
+
+/*!
+ * \brief Duplicate a TSIG key.
+ */
+int knot_tsig_key_copy(knot_tsig_key_t *dst, const knot_tsig_key_t *src);
+
+/*! @} */